Vehicle brake drum liner forming machine



Oct. 24, 1961 E. Y. sco-r'r VEHICLE BRAKE DRUM LINER FORMING MACHINE Filed Sept. 50, 1957 Emmit/ X Scott ZNVENTOR.

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United States Patent 6 3,005,481 VEHICLE BRAKE DRUM LINER FORMING MACHINE Emmitt Y. Scott, P.O. Box 66, Swainsboro, Ga., assignor of forty percent to E. H. Youngblood, Swainsboro, Ga. Filed Sept. 30, 1957, Ser. No. 687,091 3 Claims. (Cl. 153-54) The present invention relates to certain new and useful improvements in a simple, practical and economical device or machine which may be satisfactorily and effectually used to gradually bend and transform a flat strip of metal of proper gauge into a ring-like bushing, said bushing beingdesigned and adapted to assist one in repairing a worn or damaged brake drum.

Customary procedure in practice, for the most part, which is being followed in connection with brake drum repair, usually calls for complete replacement of the brake drum. While it is the practice of some to attempt to repair a brake drum surface before it becomes worn to a dangerous extent this procedure is unsatisfactory because it is quite temporary and somewhat makeshift in character. The instant concept has to do with completely resurfacing the brake drum by installing a liner. Then, the liner is finished in one way or another so that the gauge and thickness become substantially that of the original requirements resulting in virtually restoring the brake drum to its original condition.

' Stated otherwise, the invention pertains to an unusually simple and expedient roller-equipped device wherein the rollers are arranged to progressively and properly bend the metal strip until it is transformed from flat form into a complete rigid ring, said ring then becoming the liner and the liner being fitted into the brake drum and fastened and finished to bring about the desired reconditione'd job.

. In carrying out a preferred embodiment of the invention the machine or device is one which is characterized by a bottom section which is secured in a vise, or the like, and is provided with .a pair of spaced parallel rollers. Hingedly mounted on one end of the lower section is an upper relatively swingable section carrying the third required roller which latter roller is turned by a handcrank. These two sections are interrelated and hinged as the rollers come together in predetermined relationship to not only feed the metal strip between the rollers but too, at the same time impart the desired bending action thereto.

[Other objects, features and advantages will become more readily apparent from the following description and the accompanying drawing.

In the drawing wherein like numerals are employed to designate like parts through the same:

FIG. 1 is a top plan view of a bending machine or device constructed in accordance with the principles of the present invention and showing the same ready for use;

FIG. 2 is a side elevation of the same with a portion roken away;

PEG. 3 is a section on the central line 33 of FIG. 1,

looking in the direction of the arrows;

FIG. 4 is a fragmentary view with parts in section and elevation taken on the line 44 of FIG. 2;

FIG. 5 is a section on the vertical line 5-5 of FIG. 2; and

PEG. 6 is a diagrammatic view showing the fragmentary portion of a vehicle brake drum and illustrating how the liner is inserted and readied for use.

Referring now to the drawing, and with reference to FIGS. 2 and 3 in particular, it will be seen that the machine or device is characterized by a frame structure which in turn is made up, essentially, of a lower frame section 6 and a complemental upper frame section 8,

both sections being somewhat rectangular in plan as seen in FIG. 1. The lower frame section is preferably of rigid' integrated form and could, of course, be of one-piece construction but is here shown made of readily available parts including a pair of spaced parallel longitudinal frame members 10, having their right hand ends connected together by a fixed angle iron 12, the vertical flange of which is denoted at 14 and the horizontal flange 16.

There is a similar angle iron 18 at the forward or front ends which may be called the left hand ends in FIG. 3. This angle iron bridges and serves to connect the end portions 20. In fact, the horizontal flange thereof extends outwardly of the side frame members where the extended end portions are provided with holes 22. These holes serve to accommodate the headed ends 24 on the adjusting and take-up bolts 26. The threaded upper ends 28 of these bolts extend through openings provided therefor in the horizontal flange 30 of the upper angle iron 32. This angle iron has its flanges 30 and 36 fixed to the left hand end portions 36 of the spaced parallel side members 38 of the upper section or frame 8. The numerals 40 designate assembling nuts on the threaded ends of the bolts. Horizontal bolts 42 held in place by assembling nuts 44 as seen in FIGS. 3 and 5, in particular, pass through the opposed or side-by-side frame members 10 and 38 and in this way the frame members of the respective sections 6 and 8 are hingedly connected together, .that is, at the right hand end portions of said sections. The numeral 46 designates another angle iron whose horizontal flange 48 is joined to the angle irons 12 and 18. The vertical flange 50 is centrally disposed and serves not only as a rigidifying member, but also as a means whereby the entire device may be secured between the jaws of a bench vise, or the like (not shown). The side members or flanges 10 carry a pair of spaced parallel left and right idling rollers 52 and 54. These serve to cooperate with the centered upper roller 56 which latter roller has its ends journaled in bearings provided therefor in the frame members 38. One journal as seen in FIG. 4 and denoted at 55 is extended through and beyond the bearing 58 where it is projected into a socket 60 and held in place by a cotter key or equivalent fastening 62. The socket has a handcrank 64 connected thereto and the handcrank is provided with a handle 66, as seen in FIGS. 1 and 2. Thus, the handcrank is fastened or pinned to the cooperating journal 55 on the upper turnable roller 56. The unmerals 64 designate spacing collars and 66 clearance notches in the upper edge portions of the frame members 10.

It will be evident from the views of the drawing that the two frames 6 and 8 provide a frame structure wherein the lower section 6 is secured in a vise and the upper section is opened up to spread the rollers 52, 54 and 56 apart and to permit the work piece, that is, the strip member 68 to be brought into play. This strip member is of prerequisite thickness of gauge and width and length. The proportions must be reasonably exact so that the finished ring or bushing 70, as seen in FIG. 6, may be inserted and then reduced to its final thickness to provide a renewed or restored brake drum surface. In FIG. 3 we see the left hand end of the strip partly or substantially fully bent as at 72. Manifestly, by turning the crank and feeding the strip properly and slowly between the respective pressure rollers, the strip takes the final shape seen whereupon the end 74 is opposite to the end 72 and a split band or ring is thus formed. This ring becomes the desired repair bushing the worn surface part 76 of the brake drum structure. Consequently, instead of paying for a completely new brake drum job, the repair job which becomes possible as a result of this invention and technique also becomes practical.

Briefly summarized, the strip of suitable metal is formed into the aforementioned split band or ring. A screwdriver or similar instrument may be used to press the bit or blade of the same between the adjacent ends of the band and to spread and pry the same apart. Sullicient distance is thus between the end portions to allow the space provided to clear over and be removed from the roller 56'. Then proper steps are taken to obtain the requisite outside diameter to fit the job in hand. This is so that the liner will fit the inside diameter of the drum which is being repaired. Then the end portions of the liner can be welded permanently together and be installed in the drum. Then the inside diameter of the liner is obtained by putting the liner-equipped drum on a brake drum lathe so that it may be properly trued up. Many dilferent procedures and techniques are followed in shop work in this category. But the steps just referred to can be aptly and efficiently taken care of. There maybe instances where it may be necessary to open up the top frame byremoving' the nuts 4% from the bolt-ends 28 in order to swing the frame open on the pivot point and to permit removal of the roller 56 just in case the liner needs to be run through the bending machine again which, of course, sometimes happen.

From the foregoing, the construction and operation of the device will be readily understood and further explanation is believed to be necessary. However, since numerous modifications and changes will readily occur to those skilled in the art, itis not desired to limit the invention to the exact construction shown and described, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope, of the invention as claimed.

What is claimed as new is as follows:

1. A strip bending device comprising a frame structure embodying a relatively stationary lower frame section having spaced parallel side members, a first angle iron connecting the members together at one end, and a second angle iron connecting the memberstogether at their other ends, and a third angle iron attached at its ends to the respective first and second angle irons and having a depending flange which is adapted to be secured between the jaws of a vise, a pair of lower spaced parallel freely turnable rollers mounted between the side members, and an upper frame carrying a cooperating roller and having side members hingedly connected to the first named side members and also having an angle iron connecting its side members and provided with bolts whereby the openable and closable ends of said sections may be adjustably bolted together.

2. For use in bending and forming a bendable fiat-faced metal strip into a vehicle brake drum liner, a portable device embodying a frame construction having a lower frame section provided with spaced parallel horizontal side members, forward and rearward angle members com plemental to said side members and secured to the forward and rearward ends thereof and joining the four members together to provide a frame, a depending flange fixed at end portions to cooperating median portions of said angle members and capable of being clamped between the jaws of a vise when the frame construction is in use, a pair of companion spaced parallel coplanar bottom rollers mounted freely for rotation between median portions of the side members of said frame, and a complemental upper frame section cooperable with the lower frame section and having one end hingedly mounted on the side. members of the lower frame section adjacent one end portion of the first-named frame section and provided with a single crank-operated, removably mounted bending roller cooperable with the first-named rollers.

3. For use in bending and forming a bendable flat-faced metal strip into a vehicle brake drum liner, a portable machine comprising a frame embodying, a lower frame section having spaced parallel horizontal side members, forward and rearward angle members secured to the forward and rearward ends of the side members and joining the four members together to provide said frame, a flange fixed at end portions to cooperating median portions of the angle members and depending therefrom and capable of being clamped between the jaws of a vise when the machine is in use, a pair of companion spaced parallel coplanar bottom rollers mounted freely for rotation between median portions of said side members, and an upper References Cited in the file of this patent UNITED STATES PATENTS 148,122 Hoobler Mar. 3, 1874 160,647 Chapman Mar. 9, 1875 1,676,173 Wermes July 3, 1928. 1,933,957 Baldwin et al. Nov. 7, 1933 2,327,706 Halstead Aug. 24, 1943 2,587,975 Darner Mar. 4, 1952 2,617,467 Tifft Nov. 11, 1952 2,706,513

Linder Apr. 19, 1955 

